What is the thread of the self-tapping screw
Self-tapping screws can be easily screwed into the dry wall, self-drilling a hole in the steel bar and tapping the female thread. The concave head of the horn can be broken into the wallpaper or plaster when screwed in. Surface. Most of the self-tapping screws are for commercial use. For example, when the self-tapping screws are provided by the combination screws, they can provide a closer service. The self-tapping screws, such as those with thick and thin threads, focus on the assembly. loose.
Thread forming: It is developed directly from the metal screws. The thread forming self-tapping screws must be pre-drilled, then the screws are screwed into the holes, and the screws are strongly extruded to match the female threads, and the material originally in the female thread position will be Squeeze between the male threads, which is called a thread-formed self-tapping screw. It can only be applied to thin and plastic materials, so it has been developed;
Thread cutting self-tapping screws: one or more cutting edges are cut at the end of the thread, so that when screwing into the pre-drilling hole, the screw tail and the tooth portion are used to cut the matching female thread in a screw-like manner. Can be used on thick plates, relatively hard or fragile materials that are not easy to shape.
6 thread rolling into a triangular self-tapping screw, also known as Type based on the principle of forming screw tapping, the thread rolling into a self-tapping screw has a special design of the thread and the end so that the screw can be under intermittent pressure Rolled into a matching female thread. At the same time, the material around the hole can more easily fill the space of the self-tapping screw thread and the bottom of the tooth. Because the friction force is smaller than the thread forming self-tapping screw, it can be used on thicker materials. The torque required for rotation is better controlled, and the strength after combination is higher. The engineering standard definition of thread rolling into self-tapping screws is higher and more clear than the definition of material, heat treatment and strength of forming or cutting self-tapping screws. The thread is rolled into a self-tapping screw to become a true "construction" fastener.